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Linear Stability Analysis on the Influences of the Spatial Variations in Thermal Conductivity and Expansivity on the Flow Patterns of Thermal Convection with Strongly Temperature-Dependent Viscosity

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Journal of Earth Science 2014年第1期25卷 126-139页

作者： Arata Miyauchi masanori kameyama Hiroki Ichikawa Geodynamics Research Center Ehime University

A series of linear stability analysis is carried out on the onset of thermal convection in the presence of spatial variations of viscosity, thermal conductivity and expansivity. We consider the temporal evolution of an infinitesimal perturbation superimposed to a static （motionless） and con- ductive state in a basally-heated planar layer. From the changes in flow patterns with increasing the amplitudes of temperature dependence of viscosity, we identified the transition into the ＂stagnant-lid＂（ST） regime, where the convection occurs only beneath a thick and stagnant-lid of cold fluid at the top surface. Detailed analysis showed a significant increase of the aspect ratio of convection cells in ST regime induced by the spatial variations in thermal conductivity and/or expansivity： the horizon- tal length scale of ST convection can be enlarged by up to 50% with 10 times increase of thermal conductivity with depth. We further developed an analytical model of ST convection which success- fully reproduced the mechanism of increasing horizontal length scale of ST regime convection cells for given spatial variations in physical properties. Our findings may highlight the essential roles of the spatial variation of thermal conductivity on the convection patterns in the mantle.

关键词： mantle convection stagnant-lid temperature-dependent viscosity pressure- dependent thermal conductivity pressure-dependent thermal expansivity linear stability analysis.

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The Post-Perovskite Phase Transition in the Mantle and its Dynamical Consequences

The Post-Perovskite Phase Transition in the Mantle and its D...

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中国地球物理学会第22届年会

作者： David A．Yuen Marc Monnereau masanori C．kameyama Ctirad Matyska Dept.of Geology and Geophysics and Minnesota Supercomputing Institute University of Minnesota MinneapolisMN 55455-0219 U.S.A C.N.R.S.and University Paul Sabatier Toulouse Toulouse France JAMSTEC Yokohama Japan Dept.of Geophysics Faculty of Physics and Mathematics Charles UniversityPragueCzech Republic

＜正＞About three years ago Japanese researchers from the Tokyo Institute of Technology discovered from carrying out detailed experiments at pressures close to 120 GPa with synchronton radiation a new solid-state phase in the deep mantle, now called post-perovskite, which is 1.5 % heavier than perovskite, the main component in the lower mantle. These results also concurred with several theoretical predictions from first principles quantum mechanical calculations, using supercomputers. This new phase transition has

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Colon perforation due to antigenemia-negative cytomegalovirus gastroenteritis after liver transplantation: A case report and review of literature

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World Journal of Gastroenterology 2019年第15期25卷 1899-1906页

作者： Takahiro Yokose Hideaki Obara Masahiro Shinoda Yutaka Nakano Minoru Kitago Hiroshi Yagi Yuta Abe Yohei Yamada Kentaro Matsubara Go Oshima Shutaro Hori Sho Ibuki Hisanobu Higashi Yuki Masuda masanori Hayashi Miho Kawaida Takehiko Mori Takumi Fujimura Ken Hoshino Kaori kameyama Tatsuo Kuroda Yuko Kitagawa Department of Surgery Keio University School of Medicine Department of Pathology Keio University School of Medicine Division of Hematology Department of Medicine Keio University School of Medicine

BACKGROUND Cytomegalovirus(CMV) remains a critical complication after solid-organ transplantation. The CMV antigenemia(AG) test is useful for monitoring CMV infection. Although the AG-positivity rate in CMV gastroenteritis is known to be low at onset, almost all cases become positive during the disease course. We treated a patient with transverse colon perforation due to AG-negative CMV gastroenteritis, following a living donor liver transplantation(LDLT).CASE SUMMARY The patient was a 52-year-old woman with decompensated liver cirrhosis as a result of autoimmune hepatitis who underwent a blood-type compatible LDLT with her second son as the donor. On day 20 after surgery, upper and lower gastrointestinal endoscopy(GE) revealed multiple gastric ulcers and transverse colon ulcers. The biopsy tissue immunostaining confirmed a diagnosis of CMV gastroenteritis. On day 28 after surgery, an abdominal computed tomography revealed transverse colon perforation, and simple lavage and drainage were performed along with an urgent ileostomy. Although the repeated remission and aggravation of CMV gastroenteritis and acute cellular rejection made the control of immunosuppression difficult, the upper GE eventually revealed an improvement in the gastric ulcers, and the biopsy samples were negative for CMV. The CMV-AG test remained negative, therefore, we had to evaluate the status of the CMV infection on the basis of the clinical symptoms and *** This case report suggests a monitoring method that could be useful for AGnegative CMV gastroenteritis after a solid-organ transplantation.

关键词： Cytomegalovirus gastrointestinal disease Colon perforation Antigenemia negative Liver transplantation Case report

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